helper.php

<?php
/**
 * ownCloud
 *
 * @author Frank Karlitschek
 * @author Jakob Sack
 * @copyright 2010 Frank Karlitschek karlitschek@kde.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/**
 * Collection of useful functions
 */
class OC_Helper {
	private static $mimetypes=array();
	private static $tmpFiles=array();

	/**
	 * @brief Creates an url
	 * @param $app app
	 * @param $file file
	 * @returns the url
	 *
	 * Returns a url to the given app and file.
	 */
	public static function linkTo( $app, $file ){
		if( $app != '' ){
			$app .= '/';
			// Check if the app is in the app folder
			if( file_exists( OC::$APPSROOT . '/apps/'. $app.$file )){
				if(substr($file, -3) == 'php' || substr($file, -3) == 'css'){	
					if(substr($app, -1, 1) == '/'){
						$app = substr($app, 0, strlen($app) - 1);
					}
					$urlLinkTo =  OC::$WEBROOT . '/?app=' . $app;
					$urlLinkTo .= ($file!='index.php')?'&getfile=' . urlencode($file):'';
				}else{
					$urlLinkTo =  OC::$APPSWEBROOT . '/apps/' . $app . $file;
				}
			}
			else{
				$urlLinkTo =  OC::$WEBROOT . '/' . $app . $file;
			}
		}
		else{
			if( file_exists( OC::$SERVERROOT . '/core/'. $file )){
				$urlLinkTo =  OC::$WEBROOT . '/core/'.$file;
			}
			else{
				$urlLinkTo =  OC::$WEBROOT . '/'.$file;
			}
		}

		return $urlLinkTo;
	}

	/**